One size does not fit all.
Rezon sizing is based on head circumference. This is measured from the middle of the forehead and covering the widest part of the back of the head. Be sure to completely encircle the head, as shown in the illustration.
The measurement should be done using a soft, non-stretchable, flexible (cloth /plastic) tape measure, or with the Rezon custom measuring tool. The tape measure or custom measuring tool should be taut, but not too tight.
Please be aware that hairstyles that might affect the measurements. Also remove any hair clips or accessories that might alter the measurements.
Depending on the sport and personal preference, you can choose to measure above the ears or with the tape sitting on the tops of the ears. The tape should sit above the eyebrows and lie flat against the forehead.
Measure your head twice for accuracy, and measure in centimetres. Properly measuring head size will ensure the perfect fit. If you are in between sizes, choose the smaller size.
Find your corresponding size on the Rezon size chart.